KR970012379A - Dual Focus Optical Pickup - Google Patents

Dual Focus Optical Pickup Download PDF

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Publication number
KR970012379A
KR970012379A KR1019950028010A KR19950028010A KR970012379A KR 970012379 A KR970012379 A KR 970012379A KR 1019950028010 A KR1019950028010 A KR 1019950028010A KR 19950028010 A KR19950028010 A KR 19950028010A KR 970012379 A KR970012379 A KR 970012379A
Authority
KR
South Korea
Prior art keywords
beam splitter
light
incident
disk
thickness
Prior art date
Application number
KR1019950028010A
Other languages
Korean (ko)
Inventor
최양오
김기태
Original Assignee
배순훈
대우전자 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 배순훈, 대우전자 주식회사 filed Critical 배순훈
Priority to KR1019950028010A priority Critical patent/KR970012379A/en
Priority to FR9610578A priority patent/FR2738384B1/en
Priority to GB9618238A priority patent/GB2304971A/en
Priority to US08/706,305 priority patent/US5708641A/en
Publication of KR970012379A publication Critical patent/KR970012379A/en

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1395—Beam splitters or combiners
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/02—Simple or compound lenses with non-spherical faces
    • G02B3/08—Simple or compound lenses with non-spherical faces with discontinuous faces, e.g. Fresnel lens
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/10—Bifocal lenses; Multifocal lenses
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/13—Optical detectors therefor
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1372—Lenses
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1372—Lenses
    • G11B7/1374—Objective lenses
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
    • G11B2007/0006—Recording, reproducing or erasing systems characterised by the structure or type of the carrier adapted for scanning different types of carrier, e.g. CD & DVD
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1372—Lenses
    • G11B2007/13722—Fresnel lenses

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Optical Head (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

본 발명은 두께가1.2mm인 기존의 오디오 디스크와 두께가 0.6mm인 디지털 비디오 디스크에 기록된 정보를 하나의 프레넬 렌즈부를 통하여 선택적으로 읽어들일 수 있도록 하는 듀얼 포커스 광 픽업장치에 관한 것으로, 레이저빔을 발생하는 레이저 다이오드(10)와, 소정의 기울기를 갖도록 설치되고 일정한 비의 반사율과 투과율을 가져 입사광을 반사광과 투과광으로 분리하는 빔 스플리터(11)와, 상기 빔 스플리터(11)로부터 입사되는 광의 포커스가 서로 다른 위치에 형성되게 함으로써 오디오 디스크(12)와 비디오 디스크(13)이 기록된 정보를 선택적으로 읽어들일 수 있게 하는 제1프레넬 렌즈(14a), 제2프레넬 렌즈(14b)로 된 프레넬 렌즈부(14)와, 상기 빔 스플리터(11)를 통하여 입사되는 광정보를 전류로 변환시키는 광 검출기(15)로 이루어진다.The present invention relates to a dual focus optical pick-up apparatus for selectively reading information recorded on an existing audio disk having a thickness of 1.2 mm and a digital video disk having a thickness of 0.6 mm through one Fresnel lens unit. A laser diode 10 for generating a beam, a beam splitter 11 installed to have a predetermined slope and having a constant ratio of reflectance and transmittance to separate incident light into reflected light and transmitted light, and incident from the beam splitter 11 First and second Fresnel lenses 14b and 14b which allow the audio disk 12 and the video disk 13 to selectively read the recorded information by causing the focus of light to be formed at different positions. And a photodetector 15 for converting optical information incident through the beam splitter 11 into a current.

※ 선택도 제2도※ second degree of selectivity

Description

듀얼 포커스 광 픽업장치Dual Focus Optical Pickup

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제2도는 본 발명에 따른 디지털 비디오 디스크 플레이어의 듀얼 포커스 광 픽업장치의 구성도.2 is a block diagram of a dual focus optical pickup device of a digital video disc player according to the present invention.

Claims (1)

레이저 빔을 발생하는 레이저 다이오드(10)와, 소정의 기울기를 갖도록 설치되고 일정한 비의 반사율과 투과율을 가져 입사광을 반사광을 투과광으로 분리하는 빔 스플리터(11)와, 상기 빔 스플리터(11)로부터 입사되는 광의 포커스가 서로 다른 위치에 형성되게 하여 오디오 디스크(12)와 비디오 디스크(13)에 기록된 정보를 선택적으로 읽어들일 수 있게 하는 제1프레넬 렌즈(14a), 제2프레넬 렌즈(14b)로 된 프레넬 렌즈부(14)와, 상기 빔 스플리터(11)로 통하여 입사되는 광 정보를 전류로 변환시키는 광 검출기(15)를 포함하여 구성된 것을 특징으로 하는 듀얼 포커스 광 픽업장치.A laser diode 10 for generating a laser beam, a beam splitter 11 installed to have a predetermined inclination and having a constant ratio of reflectance and transmittance to separate incident light into transmitted light, and incident from the beam splitter 11 The first Fresnel lens 14a and the second Fresnel lens 14b, which allow the focused light to be formed at different positions so that the information recorded on the audio disk 12 and the video disk 13 can be selectively read. And a photodetector (15) for converting light information incident through the beam splitter (11) into a current. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019950028010A 1995-08-31 1995-08-31 Dual Focus Optical Pickup KR970012379A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
KR1019950028010A KR970012379A (en) 1995-08-31 1995-08-31 Dual Focus Optical Pickup
FR9610578A FR2738384B1 (en) 1995-08-31 1996-08-29 MULTI-FOCUS OPTICAL READING SYSTEM FOR REPRODUCING INFORMATION RECORDED ON OPTICAL DISCS
GB9618238A GB2304971A (en) 1995-08-31 1996-08-30 Multiple focus optical pickup system
US08/706,305 US5708641A (en) 1995-08-31 1996-08-30 Multiple focus optical pickup system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019950028010A KR970012379A (en) 1995-08-31 1995-08-31 Dual Focus Optical Pickup

Publications (1)

Publication Number Publication Date
KR970012379A true KR970012379A (en) 1997-03-29

Family

ID=19425447

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019950028010A KR970012379A (en) 1995-08-31 1995-08-31 Dual Focus Optical Pickup

Country Status (4)

Country Link
US (1) US5708641A (en)
KR (1) KR970012379A (en)
FR (1) FR2738384B1 (en)
GB (1) GB2304971A (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6259668B1 (en) 1996-02-14 2001-07-10 Samsung Electronics Co., Ltd. Recording/reproducing apparatus having an optical pickup device to read from and record information to disks of different thicknesses
JP3426084B2 (en) * 1996-05-24 2003-07-14 シャープ株式会社 Optical recording / reproducing device
US5883874A (en) * 1996-07-31 1999-03-16 Daewoo Electronics Co., Ltd. Optical pickup system for selectively reading a multiple number of optical disks
WO1998019303A1 (en) * 1996-10-31 1998-05-07 Sanyo Electric Co., Ltd. Optical pickup device
US6064529A (en) * 1998-07-02 2000-05-16 Optiteck, Inc. Spherical aberration correction using flying lens and method
TW479253B (en) * 1998-12-17 2002-03-11 Konishiroku Photo Ind Objective lens for correcting chromatic aberration for use in recording toor reproducing from optical information recording medium and optical pickup apparatus therewith
KR100797622B1 (en) * 2000-09-27 2008-01-23 펜탁스 가부시키가이샤 Optical system for optical head
RU2642149C2 (en) * 2016-01-12 2018-01-24 Самсунг Электроникс Ко., Лтд. Composite lens and display system containing it

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3622231A (en) * 1970-08-03 1971-11-23 Ford Motor Co Lens having optics radially symmetrical about different intersecting lines
US4210391A (en) * 1977-09-14 1980-07-01 Cohen Allen L Multifocal zone plate
JPH0762913B2 (en) * 1984-08-17 1995-07-05 株式会社日立製作所 Automatic focus control method
JPH0315003A (en) * 1989-03-16 1991-01-23 Omron Corp Grating lens and light converging grating coupler
US4936666A (en) * 1989-08-08 1990-06-26 Minnesota Mining And Manufacturing Company Diffractive lens
JP3155287B2 (en) * 1990-05-30 2001-04-09 株式会社リコー Optical information recording / reproducing device
US5410468A (en) * 1992-06-26 1995-04-25 Matsushita Electric Industrial Co., Ltd. Optical pick-up apparatus
JP2532818B2 (en) * 1993-02-01 1996-09-11 松下電器産業株式会社 Objective lens and optical head device
KR950015238A (en) * 1993-11-05 1995-06-16 배순훈 Focus error detector
JPH08203115A (en) * 1995-01-26 1996-08-09 Matsushita Electric Ind Co Ltd Optical system

Also Published As

Publication number Publication date
FR2738384B1 (en) 1999-06-25
FR2738384A1 (en) 1997-03-07
US5708641A (en) 1998-01-13
GB9618238D0 (en) 1996-10-09
GB2304971A (en) 1997-03-26

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A201 Request for examination
E902 Notification of reason for refusal
E902 Notification of reason for refusal
E601 Decision to refuse application